Fedup with vox

It has been a second month that I had an upgrade done with vox telecom, the upgrade was to get a line of 100mb/S, but to date the line is at a max of 40mb/S, even though a technician told me that the line does run at 100mb/S, now my question is, if it runs at that speed, what speed test App do you use, on one side of the house, it runs at 40mb/S at max, the other side of the house it runs at a mere 23 MB/S, not at 100mb/s.

The conclusion is do I need to downgrade again as the upgrade did not have any affect as what so ever or do I need to cancel my contract with you and find another service provider.

May someone please assist as I am now getting fedup with someone telling me that they have send it to the relevant department and that someone will phone me back, when will they phone back?? Next month?? Next year??? When????